RLP serialization routines for types used in the ETH2 spec

eth/rlp/bitseqs.nim

@@ -0,0 +1,14 @@
+import
+  stew/bitseqs, ../rlp
+
+type
+  Bytes = seq[byte]
+
+proc read*(rlp: var Rlp, T: type BitSeq): T {.inline.} =
+  T read(rlp, Bytes)
+
+proc append*(writer: var RlpWriter, value: BitSeq) =
+  append(writer, Bytes(value))
+
+export
+  bitseqs, rlp

eth/rlp/options.nim

@@ -0,0 +1,17 @@
+import
+  std/options, ../rlp
+
+proc read*[T](rlp: var Rlp, O: type Option[T]): O {.inline.} =
+  mixin read
+  if not rlp.isEmpty:
+    result = some read(rlp, T)
+
+proc append*(writer: var RlpWriter, value: Option) =
+  if value.isSome:
+    writer.append value.get
+  else:
+    writer.append ""
+
+export
+  options, rlp
+